[feat/standalonenode-withmiddleware-doc] Add docs for passing middleware option to be used with standalone mode

[nm123github]

Add documentation for passing standaloneMiddleware option to be used with standalone mode

Description (required)

This is documentation that describes the feature in this PR
withastro/astro#11516

Basically allows you to pass middleware with using @astrojs/node in standalone mode.

Related issues & labels (optional)

• Closes #11516
• Suggested label: integrations

For Astro version: 4.x. See astro PR 11425.

First-time contributor to Astro Docs?

Yes

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Warnings reference

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[sarah11918]

I can see that the accompanying astro PR is closed, so closing this docs PR to match! Hope to see you in the docs repo again!